流体动压润滑油膜厚度及油池的荧光测量
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摘要
基于面接触润滑油膜厚度荧光测量系统,研究润滑油中荧光剂强度与剪应变率的关系,筛选得到适合油膜厚度测量的润滑油和荧光剂的组合,并研究荧光强度和油膜厚度之间的关系。结果表明:R6G荧光剂和PEG400润滑油组合与Coumarin6荧光剂和PAO8润滑油组合的荧光强度不受剪应变率影响,可用于油膜厚度的荧光测量;荧光强度和油膜厚度存在单值线性关系,通过测量荧光强度可以求解油膜厚度。建立接触区周围油膜厚度及油池分布的测量方法,研究载荷和速度对油膜厚度以及接触区周围润滑剂的迁移特性的影响。结果表明:油膜厚度随速度增加而增加,随载荷增加而减小;随着速度增加,滑块入口处油池产生润滑剂堆积,出口处油池出现双侧脊分离,两侧面油池无明显变化;油池的变化是表面力、机械分离力和离心力综合作用的结果。
Based on the fluorescence measurement system of film thickness for a slider-on-disc contact,the relationship between the intensity of the fluorescent dye in the oil and the shear rate was studied.The combination of lubricant and fluorescent dye suitable for film thickness measurement was screened,and the relationship between fluorescence intensity and oil film thickness were studied.The results show that the fluorescence intensity of the combination of R6 G and PEG400 and the combination of Coumarin6 and PAO8 is not affected by shear rate.These two combinations can be used for film thickness measurement by fluorescence method.There is a linear relationship between fluorescence intensity and film thickness,so the film thickness can be calculated by measured fluorescence intensity.The measurement method of film thickness and oil pool distribution around contact area was established.The effects of load and velocity on film thickness and lubricant migration around the contact area were studied.It is shown that the film thickness is increased with the increasing of speed and the decreasing of load.As the speed increases,there is more lubricant accumulating at the inlet of the slider,and a two-ridge film profile appears at the outlet.While there is no significant change in the oil pool on both sides of the slider.The change of the oil pool is caused by the combined action of surface force,mechanical separation force and centrifugal force.
Based on the fluorescence measurement system of film thickness for a slider-on-disc contact,the relationship between the intensity of the fluorescent dye in the oil and the shear rate was studied.The combination of lubricant and fluorescent dye suitable for film thickness measurement was screened,and the relationship between fluorescence intensity and oil film thickness were studied.The results show that the fluorescence intensity of the combination of R6 G and PEG400 and the combination of Coumarin6 and PAO8 is not affected by shear rate.These two combinations can be used for film thickness measurement by fluorescence method.There is a linear relationship between fluorescence intensity and film thickness,so the film thickness can be calculated by measured fluorescence intensity.The measurement method of film thickness and oil pool distribution around contact area was established.The effects of load and velocity on film thickness and lubricant migration around the contact area were studied.It is shown that the film thickness is increased with the increasing of speed and the decreasing of load.As the speed increases,there is more lubricant accumulating at the inlet of the slider,and a two-ridge film profile appears at the outlet.While there is no significant change in the oil pool on both sides of the slider.The change of the oil pool is caused by the combined action of surface force,mechanical separation force and centrifugal force.
引文
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【10】 韩素立,郭峰,邵晶,等.基于荧光漂白成像的润滑油膜剪切流速测量[J].摩擦学学报,2017,37(4):442-448.HAN S L,GUO F,SHAO J,et al .Velocity profile measurements of oil film under pure shear based on fluorescence photobleaching imaging method[J].Tribology,2017,37(4):442-448.
【11】 白清华,郭峰,刘海超,等.面接触润滑油膜测量系统滑块倾角的快速计算[J].摩擦学学报,2015,35(5):517-524.BAI Q H,GUO F,LIU H C,et al.A robust approach to determining the slider inclination in a slider-on-disk conformal-contact lubricating film measurement system [J].Tribology,2015,35(5):517-524.
【12】 陈国珍.荧光分析法[M].北京:科学出版社,1990.
【2】 SMART A E,FORD R A J.Measurement of thin liquid films by a fluorescence technique[J].Wear,1974,29(1):41-47.
【3】 TING L L.Development of a laser fluorescence technique for measuring piston ring oil film thickness[J].Journal of Tribology,1980,102(2):165-171.
【4】 HOULT D P,LUX J P,WONG V W,et al.Calibration of laser fluorescence measurements of lubricant film thickness in engines[C]//Proceedings of Sae International Fall Fuels and Lubricants Meeting and Exhibition.[S.l.]SAE,1988.
【5】 陆霄露,邓康耀.采用激光诱导荧光法测量油膜厚度的研究[J].内燃机学报,2008,26(1):92-95.LU X L,DENG K Y.The study offilm thickness measurement by laser induced fluorescence[J].Transaction of SCICE,2008,26(1):92-95.
【6】 FOWELL M T,MYANT C,SPIKES H A,et al.A study of lubricant film thickness in compliant contacts of elastomeric seal materials using a laser induced fluorescence technique[J].Tribology International,2014,80:76-89.
【7】 杜红世.荧光技术在弹流润滑中的应用研究[D].北京:清华大学,1999.
【8】 钱善华,郭丹,路新春.微量润滑供给下润滑材料迁移特性的试验研究[J].中国机械工程,2013,24(15):2010-2015.QIAN S H,GUO D,LU X C.Experiment investigation of migration characteristics of lubricants under minimum lubricant supply conditions[J].China Mechanical Engineering,2013,24(15):2010-2015.
【9】 王茜,郭峰,韩素立.固体表面润湿性对滑块-盘接触润滑供油的影响[J].摩擦学学报,2019,39(1):73-81.WANG Q,GUO F,HAN S L.Influence of surface wettability on the lubricating oil supply in a slider-on-disc contact[J].Tribology,2019,39(1):73-81.
【10】 韩素立,郭峰,邵晶,等.基于荧光漂白成像的润滑油膜剪切流速测量[J].摩擦学学报,2017,37(4):442-448.HAN S L,GUO F,SHAO J,et al .Velocity profile measurements of oil film under pure shear based on fluorescence photobleaching imaging method[J].Tribology,2017,37(4):442-448.
【11】 白清华,郭峰,刘海超,等.面接触润滑油膜测量系统滑块倾角的快速计算[J].摩擦学学报,2015,35(5):517-524.BAI Q H,GUO F,LIU H C,et al.A robust approach to determining the slider inclination in a slider-on-disk conformal-contact lubricating film measurement system [J].Tribology,2015,35(5):517-524.
【12】 陈国珍.荧光分析法[M].北京:科学出版社,1990.